According to [1]}, the achievable data rate \(R\)  for a finite blocklength of \(m\)  symbols \((m\ge 100 )\) , and an acceptable BLER \(\varepsilon \)  , has an exact approximation as
\(R\approx C-\sqrt{\frac{V}{m}}\frac{Q^{-1}(\varepsilon )}{\ln 2}\) 
